Hardware What is the purpose of this piece of foam on the New 3DS XL motherboard?

Pluupy

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So i'm trying to find out why my new 3DS XL isn't reading game cards. The D-pad works and the pins within the cartridge reader look fine. I've used a dust can on the cartridge reader slot. Decided to open it up to give it a thorough look around.

While doing so, I noticed that the main motherboard and cartridge reader daughterboard have some gold contacts that meet when seated into the device housing. On the main motherboard, there is a small piece of foam that sits on a gold plate. The foam is a little mangled.

What is the purpose of this foam and gold plate? Is it possible that it may be preventing the 3DS and cartridge reader from communicating?
 

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